Patents by Inventor Shigeki Nishizumi

Shigeki Nishizumi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Vacuum circuit breaker
    Publication number: 20020134757
    Abstract: A vacuum circuit breaker including a metal tank containing insulation gas with a branched portion connecting a first bushing containing a vacuum valve, and another branched portion connecting a second bushing containing a first conductor, and a branched conductor in the metal tank connecting the vacuum valve and the first conductor.
    Type: Application
    Filed: March 22, 2002
    Publication date: September 26, 2002
    Inventors: Shigeki Nishizumi, Takeo Toyoda, Toru Kamikawaji, Isao Hioki
  • UHV breaker provided with resistances
    Patent number: 5457294
    Abstract: A resistance-provided UHV breaker includes a tank, a main contact unit, a resistance unit, and a resistance contact unit. The main contact unit includes plural main contacts arranged in the axial direction of the tank. The resistance unit includes plural resistances arranged in the axial direction of the tank. The resistance contact unit cooperates with the resistance unit to form a resistant parallel circuit and it is arranged, crossing the axial direction of the tank. The main and resistance contact units are opened and closed by an operating mechanism arranged outside the tank.
    Type: Grant
    Filed: June 18, 1993
    Date of Patent: October 10, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Norimitsu Kato, Hiroshi Sato, Shigeki Nishizumi, Hiroaki Toda, Hisatoshi Ikeda
  • Resistor-provided UHV breaker having delaying/operating mechanism for making and breaking main contacts and resistor contacts
    Patent number: 5424504
    Abstract: A resistor-provided UHV breaker has a tank sealing an insulating gas therein, a main contact unit located in the tank, a resistor unit connected parallel to the main contact unit, a resistor contact unit located in the tank, a main contact making/breaking unit for making and breaking the main contact unit, and a resistor contact making/breaking unit for making and breaking the resistor contact unit. Further, the breaker has a coupling unit for coupling the main contact making/breaking unit with the resistor contact making/breaking unit. The coupling unit drives the main contact making/breaking unit together with the resistor contact making/breaking unit during closing operation of the main contact unit, and drives the main contact making/breaking unit and the resistor contact making/breaking unit, independently, during breaking operation of the main contact unit.
    Type: Grant
    Filed: October 14, 1993
    Date of Patent: June 13, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tsutomu Tanaka, Shigeki Nishizumi
  • Resistor-provided UHV breaker
    Patent number: 5401923
    Abstract: A resistor-provided UHV breaker includes a tank, a main contact unit, a resistor unit, a resistor contact unit, support members, and a displacement absorbing system. The support members are arranged between the main contact and the resistor unit to support the resistor unit relative to the main contact unit. The displacement absorbing system is arranged at both ends of the resistor unit to absorb the relative displacement of the resistor unit in its axial direction.
    Type: Grant
    Filed: July 16, 1993
    Date of Patent: March 28, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Norimitsu Kato, Hiroshi Sato, Shigeki Nishizumi, Hiroaki Toda, Hisatoshi Ikeda